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Mercury is a useful material to use in a manometer because of its high density. This means that a much shorter column is needed compared to water. [2] For instance, the pressure represented by a column of 100 mm of water is just under 7.4 mm of mercury . [3]
The most common choices for a manometer's fluid are mercury (Hg) and water; water is nontoxic and readily available, while mercury's density allows for a shorter column (and so a smaller manometer) to measure a given pressure. The abbreviation "W.C." or the words "water column" are often printed on gauges and measurements that use water for the ...
A sphygmomanometer (/ ˌ s f ɪ ɡ m oʊ m ə ˈ n ɒ m ɪ t ə r / SFIG-moh-mə-NO-mi-tər), also known as a blood pressure monitor, or blood pressure gauge, is a device used to measure blood pressure, composed of an inflatable cuff to collapse and then release the artery under the cuff in a controlled manner, [1] and a mercury or aneroid manometer to measure the pressure.
A glass McLeod gauge, drained of mercury. A McLeod gauge is a scientific instrument used to measure very low pressures, down to 10 −6 Torr (0.133 mPa).It was invented in 1874 by Herbert McLeod (1841–1923). [1]
A Knudsen manometer uses this temperature-effect to make a plate with dual temperatures rotate. It consists of a rotating plate, of which the centre of rotation is in the centre of the plate. Image the plate rotating, the parts that push the 'air' are the plate parts that are 'normal' temperature, the other sides are heated.
The venturi meter and manometer is a common type of flow meter which can be used in many fluid applications to convert differential pressure heads into volumetric flow rate, linear fluid speed, or mass flow rate using Bernoulli's principle.
A colleague of Calandra posed the barometer question to a student, expecting the correct answer: "the height of the building can be estimated in proportion to the difference between the barometer readings at the bottom and at the top of the building". [19]
The problem with this method was that if tires all lost the same pressure then none would show up against the others to indicate a problem. However, research has shown that both direct and indirect tire pressure monitoring systems are equally effective.
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